121112100111 has 16 divisors (see below), whose sum is σ = 175602920544. Its totient is φ = 73938069504.

The previous prime is 121112100091. The next prime is 121112100113. The reversal of 121112100111 is 111001211121.

It is not a de Polignac number, because 121112100111 - 2¹⁴ = 121112083727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112100113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32089290 + ... + 32093063.

It is an arithmetic number, because the mean of its divisors is an integer number (10975182534).

Almost surely, 2^121112100111 is an apocalyptic number.

121112100111 is a deficient number, since it is larger than the sum of its proper divisors (54490820433).

121112100111 is a wasteful number, since it uses less digits than its factorization.

121112100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64182410.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121112100111 its reverse (111001211121), we get a palindrome (232113311232).

The spelling of 121112100111 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred thousand, one hundred eleven".